--If you can, weld something onto the end and work it out that way.
Here's a link to a photo of how I did this with a #10 tap:
http://www.flickr.com/photos/steambo...57624880666386

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"Steamboat Ed" Haas : Steel, Stainless, Titanium:
Hacking the Trailing Edge! : Guaranteed Uncertified Welding!
www.nmpproducts.com
---Decks a-wash in a sea of words---